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' fr; WILSON. y GRINDING MILL. .No.1 292,524. j y PatennedJan. 29,1884.

Fig]v @ff/@M N4 FETERS'PhlbLiI-Mgmpher. Wilhlngfon. EL CA UNITED STATES i PATENT GEEIOE.

FRANK WILSON, OF EASTON, PA., ASSIGNOE OE Two-THIEES To JOHN L.

WILSON AND JAMES E. WILSON, BOTH OE SAME PLACE.

GRINDINGJMILL.

SPECIFICATION forming part of Letters Patent No. 292,524, dated January 29, 1884.

Application tiled November 14, 1883.

(No model l T0 all whom, it may concern..-

Be it known thatv I, FRANK WILSON, a citizen of the United States', and a resident of the city of Easton, in the county of Northampton and State ofy Pennsylvania, have invented c'ertain new 'and usefulv Improvements in Grinding-Mills, of which the following is a full,-

section, portions being broken off, of a modied form of construction. Fig. 3 is a per` spective end elevation, showing the discharge end of the machine. Fig. 4 is an end View of the shell or non-revoluble portion ofthe machine. Fig. 5 is an elevation of the outer end portionv of the mill as detached from the shell. v ical grinding-shaft. Fig. 7 is an end view of thelarge end of the grinding-cone. Fig. 8 is an elevation showing the outer face of the disk as constructed when such disk is made detachable. Fig.. 9 is a plan view of the detachable disk. Fig. 10 is an end view, drawn to a reduced scale, of the frame and shell, the grinding cone being removed, showing the manner in which the two parts are sometimes made separately andafterward united.

A is the body or frame of the machine, and a a are perforated lugs by which it is adapted to be secured upon any Suitable support.

B is the conical shell or receptacle for the substance which is to be ground, provided, as shown-in Figs. 1, 2, 4, and 10, with atooth, b,

arranged centrally in the bottomthereof and at or near the larger end, as shown, and with a series of serrations, b, `extending along the bottom of the shell and to a point below the feed-supply opening, and extending `on the side opposite the feed-opening to the top or nearly to the top of the shell.

Fig. 6 is au elevation of the con- C is a grinding and' discharging disk, which is either cast with the body or frame of the mill, as in Figs. l and 5, or separately therefrom for subsequent attachment, as in Figs. 2, 3, 8, and 9, to the end of a conical grindingshaft. The disk is constructed somewhat after the manner of a spider-wheel; but it will be noted that the inner edges of its bars or webs c", which are sharp, are placed in a direction opposed to that which is given to the material which is being ground, and that the oriices b enlarge outwardly.

D is the conical grinding-shaft, which is adapted to be placed by its ends D Dl in the journal-bearings B B of thev shell and the disk. Upon its surface are arranged, preferably spirally, as shown, crushing and cutting ridgesd, two or more in number, as may be desired. These crushing or grinding ridges, divided into teeth d by thenotches or grooves d, may extend fromend to end of the cone;

or they may terminate at a short distance from0 the largeend of the cone, as shown in Figs. 1, 2, and 6. When the latter form is used, arms or teeth d3 d3, arranged tangentially t0 the periphery of the cone, as shown in Figs. l, 2, 6, and 7, willl be provided at its larger extremity, the cutting-face of the teeth being perpendicular, or substantially so, to the axis of the cone.r

When the separate cutting and discharging disk C is employed, it will be provided with a recess, 0, to receive a spline, c, the lower or inner portion of which will engage witha corresponding slot or groove formed in the face of the journal D of the cone'D, as represented in Fig. 2. This detached disk will be secured against displacement by a cross-bar, D3,which is provided with an orifice at its mid-length, by which it is passed over the end D of the shaft, and with end orifices, by which it is bolted to the frame or supporting portion of the machine.

When the mill is of small dimensions, thelarger end of the shell may rest on a suitable ledge, e, as in Fig. 1, and the shell may be secured to the disk portion by means of a suitconical parts, one of which is adapted to t IOO within the other, as in Fig. l0; but it is immaterial, except as a matter of convenience in casting the parts, of how many sections the shell is composed.

The tooth b is ordinarily made detachable, its lower portion enlarging downwardly, as shown in Fig. 4 and in i'ull lines in Fig. l0.

The detachable disk C may be provided with a projecting perforated portion, 0', to increase the bearing-surface upon thejournals.

Ordinarily all the parts will be composed of iron; but the tooth b when made detachable and adapted to tit within a cavity, b, and, if desired, other crushing-surfaces, may be of steel.

In operation, a crank, F, will be applied to the end D of the shaft, and secured by means of a setscrew,f, but, if desired, the end of the shaft lnay be squared to receive the crank in the ordinary manner. Material being supplied through the hopper E, such portions thereof as are adapted to be engaged b v the projections on the inner surface ot' the shell and by the spiral projections 011 the surfaceof the conical portion ot' the grinding-shaft will be crushed thereby, while the larger portions will be gradually moved along the downwardly-inclined interior bottom surface of the shell until they are brought into position to be operated upon bythe central tooth, b, and the other contiguous crushing-surfaces at the discharging end of the machine, the ground material being continuously discharged through the orifices b" in the disk.

Having thus described my invention, what I desire to claim and secure by Letters Patent 1. The combination, with the shells of a grinding-mill, of a central crushing tooth placed in the lower portion of the shell and projecting upwardly to a considerable distance above the plane of the upper extremities ofthe serrations upon the contiguous inner surface of the lower portion of the shell.

2. The combination, with the shell of a grinding-mill, the inner surface of which is provided with a series of serrations, of a central crushing-tooth located at the bottom of the discharging end of the shell and projecting upwardly above the general surface o1" the interior bottom portion of the same.

3. The combination, with the shell of a grinding-mill, of a crushing-tooth which is centrally located in the bottom of the shell,at one end thereof, and a revoluble cone which is provided with crushing arms or teeth which are adapted to move unground material against the centrally-located crushing-tooth.

4. The combination of a. grinding:r -shell which has interior serrations, and an upwardly-projecting tooth, with a revoluble cone which has spiral grinding-ridges and end crushing arms or teeth.

5. r] `he combination, in a grinding-mill, ofa shellthe interior surface of which is provided with a series of serrations and an end crushing-tooth, and the larger end of which is provided with a disk which has a series of discharge-openings, with a revoluble grindingcone which has upon its sides spiral ridges and upon its larger end crushing arms or teeth, substantially as described.

6. rlhe combination, with the shaft or journal of a grinding-mill, of a detachable disk', suoli disk being provided with cutting-surfaces and with outwardly-enlarging orifices, through which the ground material is ejected when the mill is in operation.

7. The combination, in a grinding-mill, of a shell the interior s irface of which has a s( ries of serrations, a revoluble cone which has spirally-arranged ridges and end crushing arms or teeth, and a disk which has outwardly-cnlarging discharge-orifices.

FRANK WILSON. lVitnesses:

L. H. RosEBURY, A. L. KUTZ. 

